Mechanisms for Impaired Adaptation to Aerobic Exercise with Metabolic Disease

Information

  • Research Project
  • 10261588
  • ApplicationId
    10261588
  • Core Project Number
    R01DK124258
  • Full Project Number
    5R01DK124258-02
  • Serial Number
    124258
  • FOA Number
    PA-19-056
  • Sub Project Id
  • Project Start Date
    9/15/2020 - 3 years ago
  • Project End Date
    8/31/2025 - a year from now
  • Program Officer Name
    LAUGHLIN, MAREN R
  • Budget Start Date
    9/1/2021 - 2 years ago
  • Budget End Date
    8/31/2022 - a year ago
  • Fiscal Year
    2021
  • Support Year
    02
  • Suffix
  • Award Notice Date
    8/9/2021 - 2 years ago

Mechanisms for Impaired Adaptation to Aerobic Exercise with Metabolic Disease

PROJECT SUMMARY/ABSTRACT Exercise capacity, also known as cardiorespiratory fitness, has emerged as one of the single best predictors of health and longevity. Low exercise capacity is a strong risk factor for the development of cardiovascular disease and overall mortality. Aerobic exercise training is the only effective treatment to increase exercise capacity and reduce the health risks associated with low exercise capacity. However, even when levels of physical activity are matched, exercise capacity remains lower in people with metabolic diseases such as Type 1 and Type 2 diabetes compared to those without metabolic disease, suggesting a phenotype of ?low response to training?. The goal of this investigation is to determine the mechanisms that contribute to low response to training in metabolic disease, and develop treatment strategies to improve the response to exercise. Clinical investigations and our data from animal models suggest that chronically high blood glucose levels (i.e. hyperglycemia) may be a cause for low response to training by blunting beneficial adaptations that normally occur with exercise in tissues like skeletal muscle. We hypothesize that hyperglycemia causes glycation and accumulation of the extracellular matrix (ECM) in muscle, and in turn, these glucose-induced ECM alterations can prevent tissue remodeling with exercise in 3 distinct ways: 1) Altering muscle signal transduction via a newly discovered JNK/SMAD mechanical signaling axis; 2) Impairing the function of muscle progenitor and endothelial cells; and 3) Reducing levels of circulating ECM remodeling proteins. One specific aim is to determine whether blood glucose lowering treatments can improve exercise capacity and muscle remodeling in response to exercise in animal models of metabolic disease. A second aim is to determine the cellular and molecular mechanisms in muscle that contribute to low exercise response under conditions of hyperglycemia. Finally, we will use advanced proteomic screening combined with in vitro methodology to identify circulating mediators of low response to training in humans subjects. Hyperglycemia is becoming more common as rates of metabolic disease rise globally. This may lead to a population that is increasingly resistant to improved exercise capacity with training, and the associated reduction in health risk. Despite significant clinical evidence linking chronic hyperglycemia to the ?low-response to training? phenotype, little is known about the molecular mechanisms underlying these associations. This project will significantly advance our understanding of the mechanisms that cause low response to training in people with metabolic disease, and identify treatments to improve exercise capacity, health span, and longevity.

IC Name
NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES
  • Activity
    R01
  • Administering IC
    DK
  • Application Type
    5
  • Direct Cost Amount
    337623
  • Indirect Cost Amount
    212506
  • Total Cost
    550129
  • Sub Project Total Cost
  • ARRA Funded
    False
  • CFDA Code
    847
  • Ed Inst. Type
  • Funding ICs
    NIDDK:550129\
  • Funding Mechanism
    Non-SBIR/STTR RPGs
  • Study Section
    SMEP
  • Study Section Name
    Skeletal Muscle and Exercise Physiology Study Section
  • Organization Name
    JOSLIN DIABETES CENTER
  • Organization Department
  • Organization DUNS
    071723084
  • Organization City
    BOSTON
  • Organization State
    MA
  • Organization Country
    UNITED STATES
  • Organization Zip Code
    022155306
  • Organization District
    UNITED STATES